IMessageSink Interfaccia

Definizione

public interface class IMessageSink

public interface IMessageSink

[System.Runtime.InteropServices.ComVisible(true)]
public interface IMessageSink

type IMessageSink = interface

[<System.Runtime.InteropServices.ComVisible(true)>]
type IMessageSink = interface

Public Interface IMessageSink

Derivato

System.Runtime.Remoting.Channels.BinaryClientFormatterSink

System.Runtime.Remoting.Channels.IClientFormatterSink

System.Runtime.Remoting.Channels.SoapClientFormatterSink

System.Runtime.Remoting.Messaging.AsyncResult

Attributi

ComVisibleAttribute

Esempio

Nell'esempio di codice seguente viene illustrata l'implementazione dell'interfaccia IMessageSink . Si noti che l'esempio presuppone definizioni di tipi e riferimenti all'assembly che devono essere forniti per la compilazione dell'esempio.

#using <System.Runtime.Remoting.dll>
#using <System.dll>
#using <IMessageSink_Share.dll>

using namespace System;
using namespace System::Collections;
using namespace System::Threading;
using namespace System::Runtime::Remoting;
using namespace System::Runtime::Remoting::Channels;
using namespace System::Runtime::Remoting::Channels::Http;
using namespace System::Runtime::Remoting::Proxies;
using namespace System::Runtime::Remoting::Messaging;
using namespace System::Security::Permissions;
using namespace Share;

public ref class MyProxy: public RealProxy
{
private:
   String^ myUrl;
   String^ myObjectURI;
   IMessageSink^ myMessageSink;

public:
    [System::Security::Permissions::PermissionSetAttribute(System::Security::Permissions::SecurityAction::LinkDemand)]

   MyProxy( Type^ myType, String^ myUrl1 )
      : RealProxy( myType )
   {
      myUrl = myUrl1;
      array<IChannel^>^myRegisteredChannels = ChannelServices::RegisteredChannels;
      IEnumerator^ myEnum = myRegisteredChannels->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         IChannel^ channel = safe_cast<IChannel^>(myEnum->Current);
         if ( dynamic_cast<IChannelSender^>(channel) )
         {
            IChannelSender^ myChannelSender = dynamic_cast<IChannelSender^>(channel);
            myMessageSink = myChannelSender->CreateMessageSink( myUrl, nullptr, myObjectURI );
            if ( myMessageSink != nullptr )
                        break;
         }
      }

      if ( myMessageSink == nullptr )
      {
         throw gcnew Exception( String::Format( "A supported channel could not be found for myUrl1:{0}", myUrl ) );
      }
   }

   virtual IMessage^ Invoke( IMessage^ myMesg ) override
   {
      Console::WriteLine( "MyProxy.Invoke Start" );
      if ( dynamic_cast<IMethodCallMessage^>(myMesg) )
            Console::WriteLine( "IMethodCallMessage" );

      if ( dynamic_cast<IMethodReturnMessage^>(myMesg) )
            Console::WriteLine( "IMethodReturnMessage" );

      
      Console::WriteLine( "Message Properties" );
      IDictionary^ myDictionary = myMesg->Properties;
      IDictionaryEnumerator^ myEnum = dynamic_cast<IDictionaryEnumerator^>(myDictionary->GetEnumerator());
      while ( myEnum->MoveNext() )
      {
         Object^ myKey = myEnum->Key;
         String^ myKeyName = myKey->ToString();
         Object^ myValue = myEnum->Value;
         Console::WriteLine( "{0} : {1}", myKeyName, myEnum->Value );
         if ( myKeyName->Equals( "__Args" ) )
         {
            array<Object^>^myArgs = (array<Object^>^)myValue;
            for ( int myInt = 0; myInt < myArgs->Length; myInt++ )
               Console::WriteLine( "arg: {0} myValue: {1}", myInt, myArgs[ myInt ] );
         }

         if ( (myKeyName->Equals( "__MethodSignature" )) && (nullptr != myValue) )
         {
            array<Object^>^myArgs = (array<Object^>^)myValue;
            for ( int myInt = 0; myInt < myArgs->Length; myInt++ )
               Console::WriteLine( "arg: {0} myValue: {1}", myInt, myArgs[ myInt ] );
         }
      }

      Console::WriteLine( "myUrl1 {0} object URI{1}", myUrl, myObjectURI );
      myDictionary->default[ "__Uri" ] = myUrl;
      Console::WriteLine( "URI {0}", myDictionary->default[ "__URI" ] );
      
      IMessage^ myRetMsg = myMessageSink->SyncProcessMessage( myMesg );
      if ( dynamic_cast<IMethodReturnMessage^>(myRetMsg) )
      {
         IMethodReturnMessage^ myMethodReturnMessage = dynamic_cast<IMethodReturnMessage^>(myRetMsg);
      }

      
      Console::WriteLine( "MyProxy.Invoke - Finish" );
      return myRetMsg;
   }

};


//
// Main function that drives the whole sample
//
int main()
{
   ChannelServices::RegisterChannel( gcnew HttpChannel, false );
   Console::WriteLine( "Remoting Sample:" );
   Console::WriteLine( "Generate a new MyProxy using the Type" );
   Type^ myType = MyHelloService::typeid;
   String^ myUrl1 = "http://localhost/myServiceAccess.soap";
   MyProxy^ myProxy = gcnew MyProxy( myType,myUrl1 );
   Console::WriteLine( "Obtain the transparent proxy from myProxy" );
   MyHelloService^ myService = dynamic_cast<MyHelloService^>(myProxy->GetTransparentProxy());
   Console::WriteLine( "Calling the Proxy" );
   String^ myReturnString = myService->myFunction( "bill" );
   Console::WriteLine( "Checking result : {0}", myReturnString );
   if ( myReturnString->Equals( "Hi there bill, you are using .NET Remoting" ) )
   {
      Console::WriteLine( "myService.HelloMethod PASSED : returned {0}", myReturnString );
   }
   else
   {
      Console::WriteLine( "myService.HelloMethod FAILED : returned {0}", myReturnString );
   }
}

using System;
using System.Collections;
using System.Threading;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;
using System.Runtime.Remoting.Proxies;
using System.Runtime.Remoting.Messaging;
using Share;	

namespace MyNameSpace
{

   public class MyProxy : RealProxy
   {
      string myUrl;
      string myObjectURI;
      IMessageSink myMessageSink;

      public MyProxy(Type myType, string myUrl1)
         : base(myType)
      {

         myUrl = myUrl1;

         IChannel[] myRegisteredChannels = ChannelServices.RegisteredChannels;
         foreach (IChannel channel in myRegisteredChannels )
         {
            if (channel is IChannelSender)
            {
               IChannelSender myChannelSender = (IChannelSender)channel;

               myMessageSink = myChannelSender.CreateMessageSink(myUrl, null, out myObjectURI);
               if (myMessageSink != null)
                  break;
            }
         }

         if (myMessageSink == null)
         {
            throw new Exception("A supported channel could not be found for myUrl1:"+ myUrl);
         }
      }

      public override IMessage Invoke(IMessage myMesg)
      {
         Console.WriteLine("MyProxy.Invoke Start");

         if (myMesg is IMethodCallMessage)
            Console.WriteLine("IMethodCallMessage");

         if (myMesg is IMethodReturnMessage)
            Console.WriteLine("IMethodReturnMessage");

         Console.WriteLine("Message Properties");
         IDictionary myDictionary = myMesg.Properties;
         IDictionaryEnumerator myEnum = (IDictionaryEnumerator) myDictionary.GetEnumerator();

         while (myEnum.MoveNext())
         {
            object myKey = myEnum.Key;
            string myKeyName = myKey.ToString();
            object myValue = myEnum.Value;

            Console.WriteLine("{0} : {1}", myKeyName, myEnum.Value);
            if (myKeyName == "__Args")
            {
               object[] myArgs = (object[])myValue;
               for (int myInt = 0; myInt < myArgs.Length; myInt++)
                  Console.WriteLine("arg: {0} myValue: {1}", myInt, myArgs[myInt]);
            }

            if ((myKeyName == "__MethodSignature") && (null != myValue))
            {
               object[] myArgs = (object[])myValue;
               for (int myInt = 0; myInt < myArgs.Length; myInt++)
                  Console.WriteLine("arg: {0} myValue: {1}", myInt, myArgs[myInt]);
            }
         }

         Console.WriteLine("myUrl1 {0} object URI{1}",myUrl,myObjectURI);

         myDictionary["__Uri"] = myUrl;
         Console.WriteLine("URI {0}", myDictionary["__URI"]);
         IMessage myRetMsg = myMessageSink.SyncProcessMessage(myMesg);

         if (myRetMsg is IMethodReturnMessage)
         {
            IMethodReturnMessage myMethodReturnMessage = (IMethodReturnMessage)myRetMsg;
         }

         Console.WriteLine("MyProxy.Invoke - Finish");
         return myRetMsg;
      }
   }

   //
   // Main class that drives the whole sample
   //
   public class ProxySample
   {
      public static void Main()
      {
         ChannelServices.RegisterChannel(new HttpChannel());

         Console.WriteLine("Remoting Sample:");

         Console.WriteLine("Generate a new MyProxy using the Type");
         Type myType = typeof(MyHelloService);
         string myUrl1 = "http://localhost/myServiceAccess.soap";
         MyProxy myProxy = new MyProxy(myType, myUrl1);

         Console.WriteLine("Obtain the transparent proxy from myProxy");
         MyHelloService myService = (MyHelloService)myProxy.GetTransparentProxy();

         Console.WriteLine("Calling the Proxy");
         string myReturnString = myService.myFunction("bill");

         Console.WriteLine("Checking result : {0}", myReturnString);

         if (myReturnString == "Hi there bill, you are using .NET Remoting")
         {
            Console.WriteLine("myService.HelloMethod PASSED : returned {0}", myReturnString);
         }
         else
         {
            Console.WriteLine("myService.HelloMethod FAILED : returned {0}", myReturnString);
         }
      }
   }
}

Imports System.Collections
Imports System.Threading
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Channels.Http
Imports System.Runtime.Remoting.Proxies
Imports System.Runtime.Remoting.Messaging
Imports System.Security.Permissions
Imports Share


Namespace MyNameSpace

   Public Class MyProxy
      Inherits RealProxy
      Private myUrl As String
      Private myObjectURI As String
      Private myMessageSink As IMessageSink

      <PermissionSet(SecurityAction.LinkDemand)> _
      Public Sub New(myType As Type, myUrl1 As String)
         MyBase.New(myType)

         myUrl = myUrl1

         Dim myRegisteredChannels As IChannel() = ChannelServices.RegisteredChannels

         Dim channel As IChannel
         For Each channel In  myRegisteredChannels
            If TypeOf channel Is IChannelSender Then
               Dim myChannelSender As IChannelSender = CType(channel, IChannelSender)

               myMessageSink = myChannelSender.CreateMessageSink(myUrl, Nothing, myObjectURI)
               If Not (myMessageSink Is Nothing) Then
                  Exit For
               End If
            End If
         Next channel
         If myMessageSink Is Nothing Then
            Throw New Exception("A supported channel could not be found for myUrl1:" + myUrl)
         End If
      End Sub

      <SecurityPermission(SecurityAction.LinkDemand, Flags := SecurityPermissionFlag.Infrastructure)> _
      Public Overrides Function Invoke(ByVal myMesg As IMessage) As IMessage
         Console.WriteLine("MyProxy.Invoke Start")

         If TypeOf myMesg Is IMethodCallMessage Then
            Console.WriteLine("IMethodCallMessage")
         End If
         If TypeOf myMesg Is IMethodReturnMessage Then
            Console.WriteLine("IMethodReturnMessage")
         End If

         Console.WriteLine("Message Properties")
         Dim myDictionary As IDictionary = myMesg.Properties
         Dim myEnum As IDictionaryEnumerator = CType(myDictionary.GetEnumerator(), IDictionaryEnumerator)

         While myEnum.MoveNext()
            Dim myKey As Object = myEnum.Key
            Dim myKeyName As String = myKey.ToString()
            Dim myValue As Object = myEnum.Value

            Console.WriteLine( "{0} : {1}", myKeyName, myEnum.Value)
            If myKeyName = "__Args" Then
               Dim myArgs As Object() = CType(myValue, Object())
               Dim myInt As Integer
               For myInt = 0 To myArgs.Length - 1
                  Console.WriteLine(  "arg: {0} myValue: {1}", myInt, myArgs(myInt))
               Next myInt
            End If
            If myKeyName = "__MethodSignature" And Not (myValue Is Nothing) Then
               Dim myArgs As Object() = CType(myValue, Object())
               Dim myInt As Integer
               For myInt = 0 To myArgs.Length - 1
                  Console.WriteLine("arg: {0} myValue: {1}", myInt, myArgs(myInt))
               Next myInt
            End If
         End While

         Console.WriteLine("myUrl1 {0} object URI{1}", myUrl, myObjectURI)

         myDictionary("__Uri") = myUrl
         Console.WriteLine("URI {0}", myDictionary("__URI"))

         Dim myRetMsg As IMessage = myMessageSink.SyncProcessMessage(myMesg)

         If TypeOf (myRetMsg) Is IMethodReturnMessage Then
            Dim myMethodReturnMessage As IMethodReturnMessage = CType(myRetMsg, IMethodReturnMessage)
         End If

         Console.WriteLine("MyProxy.Invoke - Finish")
         Return myRetMsg
      End Function 'Invoke
   End Class

   '
   ' Main class that drives the whole sample
   '
   Public Class ProxySample
      <PermissionSet(SecurityAction.LinkDemand)> _
      Public Shared Sub Main()
         ChannelServices.RegisterChannel(New HttpChannel())

         Console.WriteLine("Remoting Sample:")

         Console.WriteLine("Generate a new MyProxy using the Type")
         Dim myType As Type = GetType(MyHelloService)
         Dim myUrl1 As String = "http://localhost/myServiceAccess.soap"
         Dim myProxy As New MyProxy(myType, myUrl1)

         Console.WriteLine("Obtain the transparent proxy from myProxy")
         Dim myService As MyHelloService = CType(myProxy.GetTransparentProxy(), MyHelloService)

         Console.WriteLine("Calling the Proxy")
         Dim myReturnString As String = myService.myFunction("bill")

         Console.WriteLine("Checking result : {0}", myReturnString)

         If myReturnString = "Hi there bill, you are using .NET Remoting" Then
            Console.WriteLine("myService.HelloMethod PASSED : returned {0}", myReturnString)
         Else
            Console.WriteLine("myService.HelloMethod FAILED : returned {0}", myReturnString)
         End If
      End Sub
   End Class
End Namespace 'MyNameSpace

Commenti

Quando viene effettuata una chiamata al metodo nel proxy, l'infrastruttura di comunicazione remota fornisce il supporto necessario per passare gli argomenti all'oggetto effettivo attraverso i limiti remoti, chiamando il metodo oggetto effettivo con gli argomenti e restituendo i risultati al client dell'oggetto proxy.

Una chiamata al metodo remoto è un messaggio che passa dal client alla fine del server e possibilmente nuovamente. Quando supera i limiti di comunicazione remota sul modo, la chiamata al metodo remoto passa attraverso una catena di IMessageSink oggetti. Ogni sink della catena riceve l'oggetto message, esegue un'operazione specifica e delega al sink successivo nella catena. L'oggetto proxy contiene un riferimento alla prima IMessageSink necessità di usare per avviare la catena.

Per le chiamate asincrone, al momento della delega, ogni sink fornisce un sink di risposta (un altro IMessageSink) che verrà chiamato dal sink successivo quando la risposta si trova al suo ritorno.

Diversi tipi di sink eseguono operazioni diverse, a seconda del tipo di oggetto messaggio ricevuto. Ad esempio, un sink potrebbe causare l'esecuzione di un blocco, un altro potrebbe applicare la sicurezza delle chiamate, un altro potrebbe eseguire il controllo delle chiamate di flusso e i servizi di affidabilità e un altro potrebbe trasportare la chiamata a un altro processo o computer diverso AppDomain. Due o più sink di messaggi nella catena possono interagire tra loro per ogni azione specifica.

Note per gli implementatori

È importante notare che il codice che implementa l'interfaccia corrente deve fornire implementazioni per entrambi SyncProcessMessage(IMessage) e AsyncProcessMessage(IMessage, IMessageSink), poiché le chiamate sincrone possono essere convertite in chiamate asincrone e viceversa. Entrambi i metodi devono essere implementati, anche se il sink non supporta l'elaborazione asincrona.

Proprietà

Metodi

Si applica a